基于高阶WENO格式的旋翼非定常涡流场数值模拟

doi:10.7527/S1000-6893.2015.0281

Abstract

Abstract:

Aimed at improving the computational fluid dynamics (CFD) computation accuracy and reducing the numerical dissipation of the vortex flowfield of helicopter rotor, the highly-accurate CFD method based on fifth-order weighted essentially non-oscillatory (WENO) scheme has been established for numerical simulation on the unsteady flowfield of rotors. In this method, the moving-embedded grid technique has been employed in the numerical simulation, the Navier-Stokes equations have been taken as governing equations, and one equation Spalart-Allmaras turbulence model has been employed. In order to improve the computation accuracy of the rotor vortex formation and evolution, the discretization of convective fluxes and the time marching are conducted by Roe-WENO scheme and the highly efficient implicit LU-SGS (Lower-Upper Symmetric Gauss-Seidel) scheme respectively, and the parallel strategy is employed to accelerate the calculation as well. The computation of the left and right flow quantities is based on the fifth-order WENO scheme, which uses the appropriate weights to combine all the candidate stencils to obtain the fifth-order approximation. Finally aerodynamic characteristics and blade-tip vortex of the several rotors (C-T and UH-60A rotor in hover, C-T rotor in non-lifting forward flight and SA349/2 rotor in forward flight) have been simulated by the present method. Comparing numerical results with experimental data and calculated results using the JST scheme and Roe-MUSCL scheme, it is demonstrated that the present method with only 10%~20% increase of computational consumption has high accuracy and low numerical dissipation in simulating the aerodynamic characteristics and blade-tip vortex.

Key words: rotor, vortex flow, weighted essentially non-oscillatory scheme, Navier-Stokes equations, blade-tip vortex, moving-embedded grid

CLC Number:

YIN Zhizhao, ZHAO Qijun, WANG Bo. Numerical simulations for unsteady vortex flowfield of rotors based on high-order WENO scheme[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(8): 2552-2564.

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Numerical simulations for unsteady vortex flowfield of rotors based on high-order WENO scheme

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